yes nigga is generally slang for a black dude usually a friend of yoursalso usually used ironically if he would have put lucian typical nigger criminal then it would have been racism in this case its just slang not every time someone says nigga is automatically racist if you think so i believe tumblr is more up your alley of online forums racism is believing one race to be superior or better than another just saying random nigga is not thats just slang